Locking mechanism for tie down locking device

ABSTRACT

A tie down locking mechanism includes a first plate including a first cavity and a first aperture, a second plate including a second cavity and a second aperture, and a spring mechanism that biases the first and second plates into a first position and that moves the first and second plates into a second position when the bias is overcome with an application of force. Each cavity includes an interior portion connected to an opening on a perimeter of the respective plate. When the first and second plates are in the first position, the openings of the first and second cavities are aligned and the apertures are not aligned. When the first and second plates are in the second position, the openings of the first and second cavities are not aligned and the apertures are aligned.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 16/996,542 filed Aug. 18, 2020, the entirety ofwhich is incorporated herein by reference.

BACKGROUND OF THE INVENTION

The present subject matter relates generally to tie down locking devicesthat ensure that the drain plug is either inserted or removed from aboat as needed. More specifically, the present invention relates to tiedown locking devices that include a locking mechanism requiring a drainplug to operate.

While the structure and design of the drain and drain plug on a boat issimple, these components serve an important purpose in the functioningof a boat. After the user has finished boating and removes the boat fromthe water, any water that has entered the hull is drained by lifting thebow of the boat and angling the boat downwards toward the stern with thedrain plug removed. This angling positions the drain at the lowermostpoint. Prior to placing the boat into the water, the drain plug must beinserted into and secured within the drain to prevent water from flowinginto the hull. When the boat is being used, water inevitably seeps intothe hull through the seal around the drain plug, through valves andvarious pump cartridge holders, or the bilge pump within the hull.Therefore drainage of the hull is a necessary step in storing andmaintaining the boat.

It is not uncommon for boaters to accidentally forget to remove thedrain plug after boating and/or insert the drain plug back into thedrain prior to boating. Even the most experienced boaters can easilyskip these steps. When the drain plug is not removed after use, the boatis weighed down significantly by excess water in the hull. This createsdifficulty for transportation and leads to cleanliness and othermaintenance problems. When the boater forgets to insert the drain plugbefore placing the boat in the water, the hull immediately begins tofill with water when the boat is placed on the water without the boaterrealizing the problem until it is too late. Flooding of the hull leadsto costly repairs.

One common method that boaters use to help remind them to remove/insertthe drain plug is to attach the drain plug to the transom strap by astring or strap. The transom or tie down strap is durable, high-strengthbelt that is used to attach the boat to a trailer. Once the boat ismounted on the trailer, a first end of the transom strap is secured tothe stern of the boat and a second end of the transom strap is secureddirectly to the trailer. The transom strap is then pulled taut in orderto restrict movement of the boat on the trailer. The drain plug islocated in the transom of the boat stern, so securing the drain plug tothe transom strap serves as a reminder to position the drain plug asneeded. The downside of this reminder is that boaters may see the drainplug and still easily overlook the step of positioning it in place.Although it makes the drain plug more convenient, it does not guaranteeuse of the drain plug.

Accordingly, there is a need for a device that allows the watercraft tobe secured to the trailer only if the drain plug is appropriatelyremoved/inserted, as described herein.

BRIEF SUMMARY OF THE INVENTION

To meet the needs described above and others, the present disclosureprovides a tie down locking device including an aperture for receiving adrain plug, wherein the drain plug must be positioned within theaperture in order for the tie down locking device to move into a lockedposition.

By requiring installation of a drain plug in the tie down locking devicein order for the transom or tie down strap to function, the boater mustgive attention to the positioning of the drain plug, minimizing thechances that the boater will neglect to remove the drain plug whenloading the trailer and/or to insert the drain plug when preparing toboat.

In a first embodiment, the tie down locking device is a ratchet straphaving a ratchet assembly that includes a locking mechanism. The ratchetassembly is secured to a surface on the loading platform such as atrailer, and an attachment mechanism on the end of the strap is securedto the boat or object being secured to the loading platform. The ratchetassembly allows the user to tighten the strap by actuating the ratchethandle. The ratchet handle moves between an uppermost locking position,where the strap freely rotates about the axle of the ratchet assembly,and a lowermost locked position, which locks the strap into positionrelative to the axle.

The locking mechanism on the ratchet assembly includes a first pin thatlocks the handle in the uppermost locked position when the drain plug isremoved from the locking mechanism and a second pin that restrictsmovement of the handle so that it rotates about the axle but cannotreach the uppermost locked position when the drain plug is inserted intothe locking mechanism.

The first pin moves through a throughhole in the handle to obstructmovement of the handle. The second pin moves into a groove in the handleto limit the rotation of the handle about the axle. A member extendsacross a pivoting structure between the first and second pins, and aspring around the second pin biases the member into position. Placing adrain plug into an aperture adjacent to the second pin compresses thesecond pin into the groove.

When the boat is loaded onto the trailer and the ratchet strap istightened about the axle of the ratchet assembly, the ratchet handle ispositioned in a locked lowermost position. The drain plug may be storedin the aperture during transport.

When the user arrives as his destination and wants to remove the boatfrom the trailer, the drain plug in the aperture restricts movement ofthe handle such that the handle cannot reach the locked uppermostposition, which would allow the strap to fully loosen and move freelyabout the axle. Once the drain plug is removed, the handle can be movedinto the locked uppermost position, where the first pin automaticallylocks the handle into place.

The handle can move out of the uppermost locked position only when thedrain plug is positioned back into the locking device once it is time toload the boat onto the trailer again. After the user has finishedboating, he removes the drain plug from the boat and loads the boat ontothe trailer. After he tightens the strap, he stores the drain plug inthe aperture during transportation.

In a second embodiment, the tie down locking device includes first andsecond plates that cooperate together to move between an open positionand a closed position. The plates are secured together using bolts thatallows for movement of the first plate relative to the second along theplanar surfaces. A spring is positioned between first and second springprotrusions on each of the first and second plates to urge the platesapart.

The front plate includes a slotted cavity toward an upper end thereofthat angles toward an upper right corner. The slotted cavity includes anopening along a perimeter of the front plate. The rear plate includes acentrally-located rounded cavity defined by a bulbous corner toward anupper end thereof. The rear plate includes an opening along theperimeter below the bulbous corner connected to the rounded opening. Inthe open position, the front plate is positioned against the rear platesuch that the opening of the front plate is aligned with the opening ofthe second plate. In this position, the aligned openings of the frontand rear plate, respectively, can receive a structure such as a hook ona transom of a boat.

Each of the front and rear plate includes an aperture for receiving adrain plug. When the front and rear plates are in the closed position,the apertures are aligned and the drain plug must be inserted throughthe apertures in order for the plates to maintain a locked position.When the drain plug is removed, the spring biases the front platedownwardly into the open position, allowing the structure to be releasedfrom the aligned openings. The apertures are no longer aligned.

During use, the user loads the boat on the trailer and locks the transomstrap onto the transom of the boat using the locking device. The usermust remove the drain plug from the boat and insert it into the lockingdevice in order for the locking device to work. Once the user is readyto take the boat off of the trailer, the user must remove the drain plugfrom the locking device in order to open the locking device and removethe transom strap from the boat. The user is reminded to insert thedrain plug in the boat as he unloads the boat from the trailer.

An object of the invention is to provide a locking mechanism requiresthe use of a drain plug in order to operate the locking device so thatthe user is forced to remove or insert the drain plug on the boat.

Additional objects, advantages, and novel features of the solutionsprovided herein will be recognized by those skilled in the art based onthe following detail description and claims, as well as the accompanyingdrawings, and/or may be learned by production or operation of theexamples provided herein.

BRIEF DESCRIPTION OF THE DRAWINGS

The figures depict one or more embodiments of the subject matterdescribed herein. They are provided as examples only. Within thefigures, reference numbers are used to refer to elements described inthe detailed description.

FIG. 1 is a schematic diagram illustrating the internal components of afirst embodiment of a tie down locking device including the lockingmechanism of the present application.

FIG. 2 is schematic diagram illustrating the locking mechanism of FIG.1.

FIGS. 3 and 4 are schematic diagrams illustrating the locking mechanismmoving between a locked position and an open position, respectively.

FIGS. 5 and 6 illustrate a second embodiment of a tie down lockingdevice including the locking mechanism of the present application.

DETAILED DESCRIPTION OF THE INVENTION

The present application is directed to tie down locking devices thatrequire the installation of a drain plug in order to operate the lockingdevice and securely attach a boat to a loading platform. The tie downlocking devices described herein require a drain plug to be positionedin place in order to operate. While the designs require the use of adrain plug, the locking mechanisms may be used in a wide variety ofsettings, such as securing a ladder to a roof of a truck, securing anATV to a trailer, or other similar loading scenarios. In such otherembodiments, the locking device may require a separate tool in lieu ofthe drain plug.

FIGS. 1-4 illustrate a first embodiment of a tie down locking device100. In this embodiment, the tie down lockout device 100 includes aratchet strap 102 having a ratchet body 104 that attaches to theplatform 106 onto which the boat is loaded. The ratchet strap 102 iswound about a ratchet axle 108 within a rachet assembly 110, and anattachment mechanism 112 on the end of the ratchet strap 102 is securedto the transom on the boat. A locking mechanism 134 (FIG. 2) isincorporated into the ratchet assembly 110 as described in greaterdetail blow.

Referring to FIG. 1, the ratchet assembly 110 includes a ratchet handle114 that is attached to the ratchet axle 108. The ratchet axle 108 istransversely mounted and rotatably supported within the ratchet body104, and a pair of ratchet gears 116 are mounted to the ratchet axle108. The ratchet axle 108 can be rotated by actuating the ratchet handle114 in directions A and B. At the base of each side of the ratchethandle 114, first and second planar surfaces 115A, 115B are adjacent tothe axle 108 (FIGS. 2-4) outside of the ratchet gears 116 (FIGS. 3 and4) and a handle portion 115C extending outwardly from the planarsurfaces 115A, 115B.

A first end of the ratchet strap 102 is attached to the ratchet axle108, and the attachment mechanism 112 is attached to a second end of thestrap 102. Once the attachment mechanism 112 is secured on the boat, thestrap 102 is drawn taut by using the ratchet handle 114 to rotate theratchet axle 108. When the ratchet handle is moved in direction Abetween an unlocked lowermost position 114-A and an unlocked uppermostposition 114-B, the ratchet handle 114 engages the ratchet gears 116which thereby rotate the ratchet axle 108. More specifically, when theratchet handle 114 has moved to the unlocked lowermost position 114-A, aratchet locking mechanism 118 in the ratchet handle 114 is biased towardthe axle 108 and engages from the ratchet gears 116 as it moves indirection A, thereby rotating the axle 108 and winding a portion of thestrap 102 onto the axle 108. When the ratchet handle 114 has moved tothe unlocked uppermost position 114-B, the ratchet locking mechanism 118releases the ratchet gears 116 so that the ratchet handle 114 can movefreely in direction A to the lowermost position 114-A. These motions arerepeated until the strap 102 is fully tightened.

Once fully tightened, the ratchet handle 114 is positioned in a lockedlowermost position 114-C. The ratchet body 104 includes parallel bodyframe members 120 positioned outside of the ratchet gears 116. The bodyframe member 120 have an arcuate shape with an edge 122 that tracksalong the ratchet gears 116. At the lowermost point on the body framemember 120, a protrusion 124 extends radially from the body frame member120 to form a lowermost locking groove 126. The ratchet lockingmechanism 118 is biased toward the axle 108 and gears 116, and a releaselever 128 must be compressed in order to move the ratchet lockingmechanism 118 away from the axle 108 and gears 116, allowing the handle114 to move into the lowermost locking groove 126. Once the handle ispositioned in the locked lowermost position 114-C with the ratchetlocking mechanism 118 in the lowermost locking groove 126, the releaselever 126 is released and the handle 114 is in a fully locked postion,locking the strap 102 in relative to the body 104.

In order to release tension in the ratchet strap 102 in order to removethe boat from the trailer, the release lever 122 is compressed, movingthe ratchet locking mechanism 118 upwardly so that the ratchet handle114 can move out of the lowermost locking groove 126. The ratchet handle114 is then moved into the uppermost locked postion 114-D, unlocking theratchet gears 116 and permitting the ratchet axle 108 to spin freely andunwind the ratchet strap 102 from the axle 108. At an uppermost point onthe body frame member 120, a protrusion 130 extends radially from thebody frame member 120 to define an uppermost locking groove 132. Therelease lever 128 is compressed to pull the ratchet locking mechanism118 away from the gears 116 so that it can shift over the protrusion 130and into the uppermost locking groove 132. Once the handle 114 ispositioned in the locked uppermost position 114-D with the ratchetlocking mechanism 118 in the uppermost locking groove 132, the releaselever 128 is released and the handle 114 is locked in a fully releasedpostion, allowing the strap 102 to move freely away from the body 104.

FIGS. 2-4 illustrate the operation of the locking mechanism 134 of thetie down locking device. The locking mechanism 134 includes a first pin136 that moves in and out of a through-hole 138 on the planar surface115A of the handle 114 in order to restrict movement of the handle 114.The pin 136 also moves through an opening on the body frame member 120of the ratchet body 104. In other embodiments, the ratchet body 104 mayinclude additional structures or components in and around the lockingmechanism 134.

The throughhole 138 on the planar surface 115A of the handle 114 and thepin 136 are positioned such that, when the first pin 136 is insertedinto the through-hole 138 as shown in FIG. 3, the handle 114 is in thelocked uppermost postion 114-D. The handle 114 cannot move out of thelocked uppermost postion 114-D even if the release lever 128 iscompressed upwardly to move the ratchet locking mechanism 118 upward andover the protrusion 130. With the handle 114 in the locked uppermostposition 114-D, the strap moves freely within the ratchet assembly.

The first pin 136 is secured to a first end 140 of a member 142 thatextends between an aperture 144 in the body 104 for receiving the drainplug 146 and the pin 136. The member 142 extends across a pivotstructure 148, and a spring 150 or other biasing structure is positionedbetween the body 104 (or frame member 120) and a second end 152 of themember 142 adjacent to the aperture 144 as shown in FIGS. 3 and 4. Thespring 150 biases the first pin 136 into the throughhole 138 when thethroughhole is aligned with the first pin 136 and the drain plug 146 isnot inserted into the aperture 144. When a drain plug 146 is insertedinto the aperture 144, it compresses the second end 152 of the member142 against the biasing force of the spring 150, causing the first pin136 to withdraw outwardly through the throughhole 138 until the firstpin 136 no longer obstructs movement of the handle 114 as shown in FIG.4.

The user puts the handle 114 in the uppermost position 114-D whenloading the boat on the trailer. With the drain plug 146 removed, thehandle 114 is in the locked uppermost position 114-D and the strap 102moves freely about the axle 108. In order to allow the handle 114 toengage the ratchet gears 116 and allow the device 100 to ratchet thestrap 102 about the axle 108, the user inserts the drain plug 146 intothe aperture 144 as shown in FIG. 4.

A second pin 154 is positioned within the spring 150 near the aperture144. A corresponding groove 156 is formed within the planar surface 115Aof the handle 114 and the ratchet body 104 for receiving the second pin154 and therefore limiting movement of the handle 114. When the drainplug 146 is inserted into the aperture 144 as shown in FIG. 4, thespring 150 is compressed and the second pin 154 is inserted into thegroove 156. A corresponding opening or groove is also formed in the body104 or frame member 120, through which the second pin 154 extends toreach the groove 156 in the handle 114.

The length of the groove 156 is sized to allow the handle 114 to movebetween positions 114-B and 114-C as shown in FIG. 1. This movementallows for the handle 114 to engage the gears 116 and ratchet the strap102 about the axle 108. When the boat is on the trailer, the drain plug146 must be inserted into the locking mechanism 134 in order for thehandle 114 to ratchet the strap 102 tight. Once the strap 102 is fullytightened, the handle 114 moves into the locked lowermost position114-C, which secures the strap 102 in position. The drain plug 146 canremain in the locking device 100 as long as the boat is stored on thetrailer or other platform. In some situations during transport, thepresence of the drain plug 146 in the locking mechanism 134 provides anadditional safety lock to keep the handle 114 in the locked position114-C as the tie down locking device 100 is rattled during transport.

When the user decides to use the boat, the user drives the trailer tothe boat site. The strap 102 is loosened by rotating the handle 114 intothe locked uppermost position 114-D. Tension in the strap 102 can bereleased by moving the handle 114 out of the lowermost locked position114-C, but the second pin 154 limits movement of the handle that is onlyallowed by the groove 156 in the planar surface 115A of the handle 114.The handle 114 can only rotate about the axle 108 as long as the secondpin 154 is within the groove 156 when the drain plug 146 is insertedinto the aperture 144 and compressing on the spring 150 and the secondpin 154.

The user then removes the drain plug 146 from the locking mechanism 134,which releases the spring 150 and removes the second pin 154 from thegroove 156. Removal of the drain plug 146 automatically causes the firstpin 136 to be urged toward the planar surface 115A of the handle 114.When the handle 114 is moved into the position 114-D, the throughhole138 within the planar surface 115A is aligned with the first pin 136,catching the pin 136 and locking the handle 114 into the lockeduppermost position 114-D, which allows the strap 102 to be freelyreleased from the axle 108. The user can then insert the drain plug 146into the boat and remove the boat from the trailer.

FIGS. 5 and 6 illustrate a second embodiment of a tie down lockingdevice 200. In this embodiment, the tie down lockout device 200 includesfront and rear plates 202, 204 that cooperate together to move betweenan open position shown in FIG. 5 and a closed position shown in FIG. 6.The locking device 200 is attached to a strap 203, which is also securedto a trailer or other platform. During use the locking device 200connects to the transom of a boat and the strap is pulled taut. Thestrap 203 may be secured to the tie down locking device 200 through abuckle or any type of securement means.

The plates 202, 204 are secured together using a pair of bolts, rivets,or other attachment mechanisms 208 positioned within a pair of openings210 in the rear plate 204 and a longitudinal groove 212 in the frontplate 202. The bolts 208 remain stationary on the rear plate 204 whilethe front plate 202 moves within the constraints of the groove 212. Thefront and rear plates 202, 204 also include spring protrusions 214, 216parallel to the groove 212. A spring 218 is positioned between thespring protrusions 214, 216 to urge the front plate 202 downwardlyrelative to the rear plate 204.

The front plate 202 includes a slotted cavity 220 toward an upper end222 thereof that angles toward an upper right corner. The slotted cavity220 includes an opening 224 along a perimeter 226 of the front plate202. The rear plate 204 includes a centrally-located rounded cavity 228defined by a bulbous corner 230 toward an upper end 232 thereof. Therear plate 204 includes an opening 234 below the bulbous corner 230defining the rounded opening 228. In the open position of FIG. 5, thefront plate 202 is positioned against the rear plate 204 such that aportion of the opening 224 of the front plate 202 is aligned with theopening 234 of the second plate 204. In this position, the alignedopenings 224, 234 of the front and rear plate 202, 204, respectively,can receive a structure such as a hook on a transom of a boat.

Each of the front and rear plate 202, 204 includes an aperture 236, 238for receiving a drain plug. When the front and rear plates 202, 204 arein the closed position shown in FIG. 6, the apertures 236, 238 arealigned and the drain plug must be inserted through the apertures 236,238 in order for the plates 202, 204 to maintain a locked position. Whenthe drain plug is removed, the spring 218 biases the front plate 202downwardly into the open position shown in FIG. 5, allowing thestructure to be released from the aligned openings 220, 228. Theapertures 236, 238 may be either threaded or smooth for receiving drainplugs via threading or compression fit, respectively.

During use, the user loads the boat on the trailer and locks the transomstrap onto the transom of the boat using the locking device 200. Theuser must remove the drain plug from the boat and insert it into thelocking device 200 in order for the locking device 200 to work. Once theuser is ready to take the boat off of the trailer, the user must removethe drain plug from the locking device 200 in order to open the lockingdevice and remove the transom strap from the boat. The user is remindedto insert the drain plug in the boat as he unloads the boat from thetrailer.

It should be noted that various changes and modifications to thepresently preferred embodiments described herein will be apparent tothose skilled in the art. Such changes and modifications may be madewithout departing from the spirit and scope of the present invention andwithout diminishing its attendant advantages.

I claim:
 1. A tie down locking mechanism comprising: a first plateincluding a first cavity and a first aperture, wherein the first cavityincludes a first interior portion connected to a first opening on aperimeter of the first plate; a second plate including a second cavityand a second aperture, wherein the second plate is positioned againstthe first plate, wherein the second cavity includes a second interiorportion connected to a second opening on a perimeter of the secondplate; a spring mechanism that biases the first and second plates into afirst position and that moves the first and second plates into a secondposition when the bias is overcome with an application of force; and aslotted opening for receiving the strap on one of the first and secondplates; wherein, when the first and second plates are in the firstposition, the first opening of the first cavity and the second openingof the second cavity are aligned and the first aperture and the secondaperture are not aligned; and wherein, when the first and second platesare in the second position, the first opening of the first cavity andthe second opening of the second cavity are not aligned and the firstaperture and the second aperture are aligned.
 2. The tie down lockingmechanism of claim 1, wherein, when the first and second plates are inthe second position, the first opening of the first cavity and thesecond opening of the second cavity are not aligned.
 3. The tie downlocking mechanism of claim 1, wherein each of the first and secondapertures is sized to receive a drain plug of a watercraft.
 4. The tiedown locking mechanism of claim 3, wherein each of the first and secondapertures is configured to receive the drain plug when the first andsecond plates are in the closed position.
 5. The tie down lockingmechanism of claim 1, wherein each of the first and second apertures issized to receive a lock.
 6. The tie down locking mechanism of claim 1,wherein the first cavity comprises a slot angled downwardly and inwardlyfrom the first opening on an upper right corner of the perimeter of thefirst plate.
 7. The tie down locking mechanism of claim 6, wherein thesecond opening is on a right edge of the perimeter of the second plate.8. The tie down locking mechanism of claim 1, wherein the first plateincludes a plurality of openings, wherein the second plate includes agroove, wherein the plurality of openings and the longitudinal grooveare aligned, and wherein the plurality of openings in the first plateare spaced apart at a distance that is less than a length of the secondlongitudinal groove.
 9. The tie down locking mechanism of claim 8,further comprising a plurality of attachment mechanisms, each attachmentmechanism positioned in each opening of the plurality of openings of thefirst plate and extending through the longitudinal groove of the secondplate.
 10. The tie down locking mechanism of claim 9, wherein theplurality of attachment mechanisms comprises one of a plurality ofbolts, a plurality of rivets, and a plurality of screws.
 11. The tiedown locking mechanism of claim 1, wherein the first plate includes afirst spring protrusion, wherein the second plate includes a secondspring protrusion, and wherein the spring mechanism includes the firstspring protrusion, the second spring protrusion, and a spring positionedbetween the first and second spring protrusions.
 12. A methodcomprising: providing a tie down locking mechanism comprising: a firstplate including a first cavity and a first aperture, wherein the firstcavity includes a first interior portion connected to a first opening ona perimeter of the first plate; a second plate including a second cavityand a second aperture, wherein the second plate is positioned againstthe first plate, wherein the second cavity includes a second interiorportion connected to a second opening on a perimeter of the secondplate; a spring mechanism that biases the first and second plates into afirst position and that moves the first and second plates into a secondposition when the bias is overcome with an application of force; and aslotted opening for receiving the strap on one of the first and secondplates; wherein, when the first and second plates are in the firstposition, the first opening of the first cavity and the second openingof the second cavity are aligned and the first aperture and the secondaperture are not aligned; and wherein, when the first and second platesare in the second position, the first opening of the first cavity andthe second opening of the second cavity are not aligned and the firstaperture and the second aperture are aligned; threading the strapthrough the slotted opening of the one of the first and second plates;moving the first and second plates into the second position; insertingan object into the aligned first and second apertures, wherein theobject restricts movement of the first and second plate out of theclosed position.
 13. The method of claim 12, wherein the objectcomprises one of a drain plug of a watercraft and a lock.
 14. The methodof claim 13, further comprising the step of: moving the first and secondplates into the first position; positioning a structure through thealigned first opening of the first cavity and second opening of thesecond cavity into the first interior portion of the first cavity andsecond interior portion of the second cavity.
 15. The method of claim14, wherein the structure comprises a hook on a boat transom, a rack ona vehicle, a rail on a vehicle, and a rail on a trailer.